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dc.contributor.authorHong, C.X.
dc.contributor.authorFitt, Bruce D.L.
dc.date.accessioned2013-07-24T08:48:09Z
dc.date.available2013-07-24T08:48:09Z
dc.date.issued1995-10
dc.identifier.citationHong , C X & Fitt , B D L 1995 , ' Effects of inoculum concentration, leaf age and wetness period on the development of dark leaf and pod spot (Alternaria brassicae) on oilseed rape (Brassica napus) ' , Annals of Applied Biology , vol. 127 , no. 2 , pp. 283-295 . https://doi.org/10.1111/j.1744-7348.1995.tb06673.x
dc.identifier.issn1744-7348
dc.identifier.otherPURE: 1408721
dc.identifier.otherPURE UUID: b5a1281e-665c-4e92-aad1-a79e6806670c
dc.identifier.otherBibtex: urn:cfbb7d401d5f55f5d6c6e910933f3028
dc.identifier.otherScopus: 0029476607
dc.identifier.urihttp://hdl.handle.net/2299/11166
dc.description.abstractExperiments were done under controlled environment and glasshouse conditions to study the effects of inoculum concentration, leaf age and wetness period on the development of dark leaf and pod spot (Alternaria brassicae) on oilseed rape (Brassica napus). On leaves of potted oilseed rape plants (cv. Bienvenu) inoculated with A. brassicae conidial suspensions, the severity (number of lesions cm(-2)) of dark leaf spot increased as inoculum concentration increased from 80 to 660 Spores ml(-1) and as leaf age increased from 4 to 14 days. On pods on detached racemes of spring oilseed rape (cv. Starlight), the incidence of dark pod spot (% of pods diseased) increased as inoculum concentration increased from 80 to 10(4) spores ml(-1). Increasing inoculum concentration above 10(4) spores ml(-1) did not increase the incidence but did increase the severity of dark pod spot. A minimum wetness period of 4 h was needed for infection of oilseed rape leaves (cv. Envol) by A. brassicae at 18 degrees C and disease severity increased with increasing wetness period up to 12 h. The length of dry interruptions after 3-8 h of initial wetness affected the severity of dark leaf spot. A second wetness period increased the severity of dark leaf spot if the dry interruption was less than or equal to 6 h and if the first wetness period was less than or equal to 8 h. The incubation period of A. brassicae decreased from 3.5 to 2.5 days as inoculum concentration increased from 80 to 660 spores ml(-1) on leaves (cv. Bienvenu) at 17-25 degrees C and from 3.8 to 1.0 day as inoculum concentration increased from 80 to greater than or equal to 2 x 10(3) spores ml(-1) on pods (cv. Starlight) at 18 degrees C.en
dc.format.extent13
dc.language.isoeng
dc.relation.ispartofAnnals of Applied Biology
dc.subjectAlternaria blight
dc.subjectbrassica crops
dc.subjectepidemiology
dc.subjectincubation period
dc.subjectinfection
dc.titleEffects of inoculum concentration, leaf age and wetness period on the development of dark leaf and pod spot (Alternaria brassicae) on oilseed rape (Brassica napus)en
dc.contributor.institutionDepartment of Human and Environmental Sciences
dc.contributor.institutionGeography, Environment and Agriculture
dc.contributor.institutionCrop and Environmental Protection
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionHealth & Human Sciences Research Institute
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Life and Medical Sciences
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1744-7348.1995.tb06673.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstyperestrictedAccess


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